Surface treatment method

Details Surface treatment method Surface treatment method

2005-10-04

2005-10-04

Jones, Deborah (Department: 1775)

Stock material or miscellaneous articles

Composite

Of metal

C428S469000, C148S273000, C148S275000, C148S279000, C148S283000

Reexamination Certificate

active

06951691

ABSTRACT:
This invention relates to a surface treatment method comprising the steps of providing a treating solution containing a specific ammonium compound or aqueous ammonia, and magnesium silicofluoride, heating the treating solution to a temperature of 70 to 100° C., and soaking aluminum or an aluminum alloy in the treating solution; a piston having a surface coated with a film consisting of a mixture of NH4MgAlF6and MgAlF5.1.5H2O or a mixture of NH4MgAlF6and MgAl2F8.2H2O; and a sliding member made of aluminum or the like wherein the whole surface of the sliding member or the sliding surface thereof is coated with a film which consists of either of the aforesaid mixtures, has a cubic crystal structure, and shows no crystalline orientation.The present invention can provide a surface treatment method which requires simple equipment, can reduce treatment costs, and can yield aluminum or an aluminum alloy having excellent abrasion resistance, corrosion resistance and other properties, as well as sliding members and pistons having excellent abrasion resistance and other properties.

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English translation of Dec. 27, 2004 Office Action corresponding to Japanese Patent Application No. 2000-116253.

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